53515431 has 16 divisors (see below), whose sum is σ = 81426400. Its totient is φ = 34712064.

The previous prime is 53515391. The next prime is 53515447. The reversal of 53515431 is 13451535.

It is not a de Polignac number, because 53515431 - 2¹⁹ = 52991143 is a prime.

It is a super-2 number, since 2×53515431² = 5727802710231522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53515395 and 53515404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53515471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25786 + ... + 27783.

It is an arithmetic number, because the mean of its divisors is an integer number (5089150).

Almost surely, 2^53515431 is an apocalyptic number.

53515431 is a deficient number, since it is larger than the sum of its proper divisors (27910969).

53515431 is a wasteful number, since it uses less digits than its factorization.

53515431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53615 (or 53609 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 53515431 is about 7315.4241845569. The cubic root of 53515431 is about 376.8423260701.

Adding to 53515431 its reverse (13451535), we get a palindrome (66966966).

The spelling of 53515431 in words is "fifty-three million, five hundred fifteen thousand, four hundred thirty-one".